Red Onion Burger Topping

1 teaspoon olive oil
4 cups vertically sliced red onion
4 teaspoons sugar
4 teaspoons red wine vinegar
3/4 teaspoon chopped fresh thyme

To prepare jam, heat a large nonstick skillet over medium-high heat. Add oil to pan; swirl to coat. Add onion; sauté 5 minutes. Reduce heat to medium-low; stir in sugar, vinegar, and thyme. Cover and cook 10 minutes or until onion is very tender. Remove from heat.